Motor-operated drill



Oct. 13, V v

I G. JURESISIN MOTOR OPERATED DRILL Filed June 18, 1923 16' e grmwntoz J i 11 20 Mid/(Al J5 attain cc,

Patented Get. 13, 1925.

UNITED STATES GEORGE JURESISIN, OF WILKES-BARBIE, PENNSYLVANIA.

MOTOR-OPERATED DRILL.

Application filed June 18, 1923. Serial No. 646,280.

To all "whom it may concern:

Be it known that I, Gnoncn JURnsIsIN, a citizen of Czechoslovakia, residing at Wilkes-Barre, in the county of Luzerne and State of Pennsylvania, have invented certain new and useful Improvements in Motor-Operated Drills, of which the fol lowing is a specification.

This invention relates to certain new and useful improvements in motor operated drills and has particular reference to the construction of a fluid operated motor, preferably designed to be operated by air pressure.

-An object of the invention resides in the provision of an air motor for operating drills and the like, wherein the rotor within the motor casing has one side thereof spaced from an offset portion of the casing to provide a relatively long arcuate passage traversing the transverse axis of the rotor with a partition therein associated with the inlet controlling valve for the supply of air causing the air to travel tangentially in either direction for reversely rotating the rotor.

Another object of the invention resides in an air motor of the type above set forth having an eccentric mounting for a drill supporting socket within the casing of the motor with meshing gears establishing communication between the drill supporting socket and the bearing shaft of the rotor.

\Vith the above and other objects in view as the nature of the invention is better understood, the same consists of the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawing and claimed.

In the drawing, wherein like reference characters designate corresponding parts throughout the several views,

Figure 1 is a longitudinal sectional view taken on line II of Fig. 2, and

Figure 2 is a cross-sectional view taken on line 11-11 of Fig. 1.

Referring more in detail to the accompanying drawing, there is illustrated an air motor for operating drills and the like comprising a motor casing having an end wall 1 carrying a depending side wall 2 that is offset at one side thereof as at 3 to provide lateral passages 1 each extending substan-' tially one quarter of the way around the motor casing upon opposite sides of a transverse axis thereof. The offset portion 3 of the motor casing has an inlet connection .5, while a diametrically positioned outlet 6 is carried by the side wall 2 of the casing. The inlet connection 5 carries a manually operable valve 7 controlling the passage of air through the connection 5 as will'at once be obvious from an inspection of the drawing.

An arcuate partition wall 8 is preferably formed integral with the motor casing, the same being positioned adjacent the offset portion 3 and spaced therefrom as shown in Fig. 1 to provide inner walls for the lateral airpassages 4, the inner curved face of the partition 8 cooperating with the inner face of the casing wall 2 to form a complete circle. The partition wall 8 intermediate its ends, carries an outwardly directed abutment wall 9 that is engaged by a side face of the valve plug 7 to cooperate therewith for closing one of the passages 4, as shown in Fig. 1, when air passing through the connection 5 enters the other passage.

A rotor is journaled in the casing, the peripheral edge thereof wiping the inner face of the side wall 2 and the inner face of the partition 8 as shown in Fig. 1, the rotor comprising a disk plate 10 provided with a central boss 11 that carries a bearing stub shaft 12 projecting from opposite sides of the plate 10, the end wall 1 ofthe casing carrying an axial socket 13 in which one end of the bearing shaft 12 rotatably extends with anti-friction bearing balls 14 and a wearing plate l4: interposed between said end of the bearing shaft 12 and the socket 13. The inner face of the wall 1 carries an annular rib 15 supporting the disk plate 1O adjacent its outer edge, the peripheral edge of the disk plate 10 being of double walled formation, having an inner wall 16 of cylindrical form and concentric with the disk plate and parallel wall 16 and carrying spaced partitions l6 having arcuate faces between the walls 16 forming elongated air pockets 17 that open outwardly as at 18 and having their longitudinal axes extending circumferentially of the plate 10 as shown in Fig. 1. These pockets 17 constitute the buckets of the rotary member, the whole device thus constituting a species of impulse turbine.

The stub shaft 1.2 supporting the disk plate 10 of the rotor has a gear wheel 19 fixed thereto, and the bearing for the outer end of the shaft 12 includes a disk plate 20 received in the lower open end of the casing as shown in Fig. 2, the plate 20 carrying a socketed boss 21 enclosing anti-friction bearing members for the shaft 12, while a depending annular rib 20 carried by plate 20 forms a guide for the wall 16 of the rotor. The plate 20 rests on a shoulder formed in the interior of the wall 2, this shoulder being shown in Figure 2 only, as the section line on which Figure 1 is taken lies below said shoulder. A disk 28 is threaded in the upper open end of the casing and carries an eccentric apertured boss 25 in which a tool socket 26 is journaled, the socket 26 rotatably extending through the disk plate 20 and carrying a gear wheel 27 upon the inner end thereof that meshes with the gear 19, rotary motion of the stub shaft 12 being communicated to the tool socket 26 in an obvious manner. To facilitate handling of the motor casing, diametrically opposite handles 28 are carried by the side walls thereof. It will now be seen that the disk 20 holds the rotor in place without jamming as it is supported by the shoulder, the disk 20 being forced firmly against its shoulder by the disk 23.

In the operation of the device, the passage of air under compression through the connection 5 to the motor casing passages 4 is controlled by the valve 7, the air being caused to enter the desired passage therefor at the proper side of the abutment wall 9 as shown in Figure 1, and the open ends 8 of the arcuate passages a terminate at points substantially 90 degrees from the inlet 5 and outlet 6, air flowing through the selected passage and entering the pockets 17 successively and, by its impingement against the far concave faces of said pockets causing the rotor to revolve, the revolution of the rotor through the gear connections between the rotor and the tool socket 26 causing rotation of the latter. The air carried in the pockets 17 is exhausted through the outlet opening 6 as indicated by the arrows in Fig. 1, and any air remaining in the pocket is discharged in the idle passage 1 and ex hausted through the opening 3 in the offset wall 8 of themotor casing. As shown in Fig. 1, the exhaust openings 3 are selectively closed by the screw plug 29 insuring proper operation of the motor. It will be readily seen from an inspection of Fig. 1 that the rotor is caused to revolve in either direction under control of the Valve 7, the direction of rotation being controlled by the direction of flow of the air through the passages 4. The terminating of the passages 4E substantially 90 from the inlet 5 and the forming of these passages on long arcs are believed to cause the motive fluid to be delivered at a suitable angle in respect to the circumferentially elongated pockets 17 and their arcuate end walls to obtain the most power from the fluid.

While there is herein shown and described the preferred embodiment of the present in vention, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

VVhatis claimed as new is 1. An air motor for drills comprising a truly cylindrical casing, a truly cylindrical rotor chamber eccentrically formed therein and permanently closed at one end, axially alined inlet and exhaust ports for said casing with the common axis of said ports intersecting the parallel axes of the casing and rotor chamber at right angles thereto, said exhaust port communicating directly with the rotor chamber, the thickest side of the wall of the casing, formed by the eccentric location of the rotor chamber, having motive fluid feeding passages formed circumferentially therein communicating with and extending in opposite directions in respect tothe inlet port, said feeding passages conimunicating with the rotor chamber at sub stantially diametrically opposite points, a rotor in said chamber having circumferentially elongated pockets formed in its periphery with the end walls of each pocket formed on an are, means for closing the open end of said rotor chamber, a tool socket rotatably carried by said means, means for operatively connecting the rotor and tool socket, and means for selectively controlling the communication of the inlet port with the fluid feeding passagesfor causing rotation of the rotor in opposite directions.

2. An air motor for drills comprising a casing, a cylindrical rotor chamber formed in the casing and permanently closed at one end, an inlet port for the casing having branch feeding passages communicating with the rotor chamber at points spaced around the periphery of the latter, means for selectively controlling the communication of the inlet port with said passages, an exhaust port for the chamber, an annular shoulder formed in the wall of the chamber inwardly of its open end, a disk engaging said shoulder and closing the end of the chamber, axially alined. anti-friction bearings formed in the end wall of the chamber and the disk, a stub shaft journaled in the bearings. a rotor fixed to the shaft and comiao prising a circular plate, a ring like margin shoulder, a tool socket having a shank j0urformed on the plate axially ofiset toward naled in said member and rojecting the disk, and pockets formed in the periphthrough the disk, and a gear wheeil fixed on 10 ery of the margin, a gear wheel fixed on the the shank and meshing with the gear wheel 5 stub shaft between the plate and the cham- 011 h I Shaft.

ber end closing disk, a member fastened to In testimony whereof I affix my signature. the casing and holding the disk against its GEORGE J URESISIN. 

